{"instruction": "You are an expert in named entity recognition. Please extract entities that match the schema definition from the input. Return an empty list if the entity type does not exist. Please respond in the format of a JSON string.", "schema": ["Chemical"], "input": "With the development of technology and improved understanding of nuclear spin - spin interactions and their behavior in static / oscillating magnetic fields , NMR spectroscopy has emerged as a powerful tool for characterizing molecular structure in a wide range of systems of chemical , physical and biological relevance ."}
{"Chemical": []}